1/2003-1/2002的绝对值+1/2004-1/2003的绝对值-1/2004-1/2002的绝对值

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1/2003-1/2002的绝对值+1/2004-1/2003的绝对值-1/2004-1/2002的绝对值1/2003-1/2002的绝对值+1/2004-1/2003的绝对值-1/2004-1/20

1/2003-1/2002的绝对值+1/2004-1/2003的绝对值-1/2004-1/2002的绝对值
1/2003-1/2002的绝对值+1/2004-1/2003的绝对值-1/2004-1/2002的绝对值

1/2003-1/2002的绝对值+1/2004-1/2003的绝对值-1/2004-1/2002的绝对值
=(1/2002-1/2003)+(1/2003-1/2004)-(1/2002-1/2004)
=1/2002-1/2003+1/2003-1/2004-1/2002+1/2004
=0

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